- Some of the most perfect spheres manufactured by human kind. Lovely things they are. http://blog.makezine.com/2009/07/14/worlds-most-perfect-spheres/ 5 comments science
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- Gravity Probe B - Wikipedia https://en.wikipedia.org/wiki/Gravity_Probe_B 74 comments
- American and British English spelling differences - Wikipedia http://en.wikipedia.org/wiki/American_and_British_English_spelling_differences#Miscellaneous_spelling_differences 14 comments
- Kilogram - Wikipedia https://en.wikipedia.org/wiki/Kilogram#International_prototype_kilogram 3 comments
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